That all the people of the earth might know the hand of the Lord, that it [is] mighty,.... Even almighty, and can do that which is marvellous and surprising, and above the power of nature to effect; things unsearchable and past finding out, which cannot be expressed, or conceived how and by what means they are brought about; this the very Heathens would own and acknowledge when they should see these stones, and be told the meaning of them, or should hear of this amazing event:
that ye might fear the Lord your God for ever; as the above mentioned end was to be answered among the people of the earth by these stones, this among the people of Israel; who upon sight of them would call to mind the power and goodness of God, which would serve to keep an awe of his majesty on their mind, a due reverence of him and his greatness, and engage them to fear, serve, and worship him; who by such acts as these had abundantly showed himself to be the only true and living God, and the covenant God of them his people Israel; the Septuagint version is,
"that ye may worship the Lord your God in every work.''